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Homework Help: Power question involving dT?

  1. Oct 3, 2009 #1
    1. The problem statement, all variables and given/known data
    A funny car with mass of m accelerates from rest through a measured track distance D with the engine operating at a constant power P. If the track crew can increase the engine power by a differential amount dP, what is the change in the time required for the run? Express your answer exactly in terms of the variables given.

    2. Relevant equations
    P = W/t
    P = dW/dt

    3. The attempt at a solution
    I know the problem is asking for dT, but I just don't know how I would single it out. So far I've got: dT = ((dP+ P) - P)/ m * (dV/dt) * Dx which I know is not right. Any suggestions would be helpful.
  2. jcsd
  3. Oct 4, 2009 #2


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    Science Advisor
    Homework Helper

    Hi vebes02! :wink:

    Find the equation relating P and t, then just differentiate it …

    what do you get? :smile:
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